Best animated movie mistakes of 2017
Plot hole: After the car is destroyed, Gru is knocked unconscious and Dru enters Balthazar Bratt's robot to destroy the robot's core from the inside. Once Gru wakes up, Balthazar attempts to kill him with the robot's laser and Dru destroys the core causing the robot to collapse. Gru then yells out "Dru!" and runs over to the wreckage of the robot to try and find him. The problem with this is that since Gru was knocked unconscious before Dru entered the robot, and Gru knew nothing of Dru's plan to disable the robot's core, there is no way for him to know that Dru was inside the robot.
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Continuity mistake: At the beginning of this film, Paddington is shown living with two adult bears. The Explorer gives them their names, and introduces them to marmalade sandwiches. In Paddington 2, the bears are shown on a bridge, eating marmalade sandwiches and referring to each other by name before they see the little bear on the log, who is young Paddington.